Michael Davidsaver
670 lines
22 KiB
C++
670 lines
22 KiB
C++
/*
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* pvxs is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*
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* Author George S. McIntyre <george@level-n.com>, 2023
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*
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*/
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#include <string>
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#include <algorithm>
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#include <atomic>
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#include <special.h>
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#include <epicsTime.h>
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#include <epicsStdlib.h>
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#include <epicsString.h>
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#include <pvxs/log.h>
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#include "alarm.h"
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#include "iocsource.h"
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#include "dbentry.h"
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#include "dberrormessage.h"
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#include "typeutils.h"
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#include "credentials.h"
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#include "securityclient.h"
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#include "securitylogger.h"
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#include "utilpvt.h"
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// include last to avoid clash of #define printf with other headers
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#include <epicsStdio.h>
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DEFINE_LOGGER(_log, "pvxs.ioc.db");
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namespace pvxs {
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namespace ioc {
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void IOCSource::initialize(Value& value, const MappingInfo &info, const Channel& chan)
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{
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if(info.type==MappingInfo::Scalar) {
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if(auto fld = value["display.form.choices"]) {
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shared_array<const std::string> choices({
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"Default",
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"String",
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"Binary",
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"Decimal",
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"Hex",
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"Exponential",
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"Engineering",
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});
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fld = choices;
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if(dbIsValueField(dbChannelFldDes(chan))) { // only apply Q:form to VAL
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auto tag(chan.format());
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for(auto i : range(choices.size())) {
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if(choices[i] == tag) {
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value["display.form.index"] = i;
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break;
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}
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}
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}
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}
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}
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}
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static
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void getScalarValue(dbChannel* pChannel,
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db_field_log *pfl,
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Value& value)
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{
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long nReq = 1;
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union {
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double _align;
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char _size[MAX_STRING_SIZE];
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char str[MAX_STRING_SIZE];
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} buf;
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DBErrorMessage dbErrorMessage(dbChannelGet(pChannel, dbChannelFinalFieldType(pChannel),
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&buf, nullptr, &nReq, pfl));
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if (dbErrorMessage) {
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throw std::runtime_error(SB()<<dbChannelName(pChannel)<<" "<<__func__<<" ERROR : "<<dbErrorMessage.c_str());
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} else if(nReq==0) {
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// this was an actual max length 1 array, which has zero elements now.
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memset(&buf, 0, sizeof(buf));
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}
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switch(value.type().code) {
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case TypeCode::String:
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buf.str[sizeof(buf.str)-1] = '\0';
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value = buf.str;
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break;
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#define CASE(ENUM, TYPE) \
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case TypeCode::ENUM: value.from(*(const TYPE*)&buf); break
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CASE(Int8, int8_t);
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CASE(Int16, int16_t);
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CASE(Int32, int32_t);
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CASE(Int64, int64_t);
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CASE(UInt8, uint8_t);
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CASE(UInt16, uint16_t);
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CASE(UInt32, uint32_t);
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CASE(UInt64, uint64_t);
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CASE(Float32, float);
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CASE(Float64, double);
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#undef CASE
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case TypeCode::Struct:
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if(auto index = value["index"]) {
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if(dbChannelFinalFieldType(pChannel)==DBR_ENUM) {
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index.from(*(epicsEnum16*)&buf);
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break;
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}
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}
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default:
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throw std::logic_error(SB()<<__func__<<" unsupported "<<value.type());
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}
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}
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static
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void getArrayValue(dbChannel* pChannel,
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db_field_log *pfl,
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Value& value)
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{
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auto final_type(dbChannelFinalFieldType(pChannel));
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auto buf(std::make_shared<std::vector<char>>(dbChannelFinalElements(pChannel) * dbChannelFinalFieldSize(pChannel)));
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long nReq = dbChannelFinalElements(pChannel);
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DBErrorMessage dbErrorMessage(dbChannelGet(pChannel, final_type,
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buf->data(), nullptr, &nReq, pfl));
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if (dbErrorMessage) {
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throw std::runtime_error(SB()<<dbChannelName(pChannel)<<" "<<__func__<<" ERROR : "<<dbErrorMessage.c_str());
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}
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if(final_type == DBR_CHAR && value.type()==TypeCode::String && !buf->empty()) {
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// long string
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(*buf)[buf->size()-1u] = '\0'; // paranoia?
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value = std::string(buf->data());
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} else if(final_type == DBR_STRING) {
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shared_array<std::string> arr(nReq);
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for(long n = 0; n < nReq; n++) {
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auto sval = &(*buf)[n*MAX_STRING_SIZE];
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auto nlen = strnlen(sval, MAX_STRING_SIZE);
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arr[n] = std::string(sval, nlen);
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}
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value.from(arr.freeze());
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} else {
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std::shared_ptr<char> cbuf(buf, buf->data());
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buf.reset(); // TODO: c++14 adds aliasing ctor by move()
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shared_array<void> arr(cbuf, nReq, value.type().arrayType());
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cbuf.reset();
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value.from(arr.freeze());
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}
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}
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// update timeStamp.* and maybe alarm.*
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static
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void getTimeAlarm(dbChannel* pChannel,
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db_field_log *pfl,
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Value& node,
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const MappingInfo& info,
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UpdateType::type change)
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{
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long nReq = 0;
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long options = DBR_STATUS | DBR_AMSG | DBR_TIME | DBR_UTAG;
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struct ValueTimeAlarm {
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DBRstatus
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DBRamsg
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DBRtime
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DBRutag
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} meta;
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DBErrorMessage dbErrorMessage(dbChannelGet(pChannel, dbChannelFinalFieldType(pChannel),
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&meta, &options, &nReq, pfl));
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if (dbErrorMessage) {
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throw std::runtime_error(SB()<<dbChannelName(pChannel)<<" "<<__func__<<" ERROR : "<<dbErrorMessage.c_str());
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}
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// options may be updated.
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// as of base 7.0.6 time/alarm meta-data is always available
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if(change & UpdateType::Alarm) {
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const char* stsmsg = nullptr;
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if(options & DBR_STATUS) {
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// PVA status != DB status
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uint32_t status;
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switch(meta.status) {
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case NO_ALARM:
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status = 0;
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break;
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case READ_ALARM:
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case WRITE_ALARM:
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case HIHI_ALARM:
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case HIGH_ALARM:
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case LOLO_ALARM:
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case LOW_ALARM:
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case STATE_ALARM:
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case COS_ALARM:
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case HW_LIMIT_ALARM:
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status = 1; // DEVICE
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break;
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case COMM_ALARM:
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case TIMEOUT_ALARM:
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case UDF_ALARM:
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status = 2; // DRIVER
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break;
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case CALC_ALARM:
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case SCAN_ALARM:
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case LINK_ALARM:
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case SOFT_ALARM:
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case BAD_SUB_ALARM:
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status = 3; // RECORD
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break;
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case DISABLE_ALARM:
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case SIMM_ALARM:
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case READ_ACCESS_ALARM:
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case WRITE_ACCESS_ALARM:
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status = 4; // DB
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break;
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default:
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status = 6; // UNDEFINED
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}
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if(meta.status < ALARM_NSTATUS)
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stsmsg = epicsAlarmConditionStrings[meta.status];
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node["alarm.status"] = status;
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node["alarm.severity"] = meta.severity;
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}
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#if DBR_AMSG
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if((options & DBR_AMSG) && meta.amsg[0]) {
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node["alarm.message"] = meta.amsg;
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} else
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#endif
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{
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node["alarm.message"] = meta.status && stsmsg ? stsmsg : "";
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}
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} // DBE_ALARM
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if(options & DBR_TIME) {
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node["timeStamp.secondsPastEpoch"] = meta.time.secPastEpoch + POSIX_TIME_AT_EPICS_EPOCH;
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node["timeStamp.nanoseconds"] = meta.time.nsec & ~info.nsecMask;
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}
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#if DBR_UTAG
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if(options & DBR_UTAG) {
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auto utag = meta.utag;
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if(info.nsecMask)
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utag = meta.time.nsec & info.nsecMask;
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node["timeStamp.userTag"] = utag;
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}
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#endif
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}
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static
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void getProperties(dbChannel* pChannel, db_field_log *pfl, Value& node)
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{
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struct PropertyMeta {
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DBRunits
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DBRprecision
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DBRenumStrs
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DBRgrDouble
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DBRctrlDouble
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DBRalDouble
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} meta;
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long options = DBR_UNITS | DBR_PRECISION | DBR_ENUM_STRS | DBR_GR_DOUBLE | DBR_CTRL_DOUBLE | DBR_AL_DOUBLE;
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auto dbr_type = dbChannelFinalFieldType(pChannel);
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long nReq = 0; // only meta. (so DBF type ignored)
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DBErrorMessage dbErrorMessage(dbChannelGet(pChannel, dbr_type,
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&meta, &options, &nReq, pfl));
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if (dbErrorMessage) {
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throw std::runtime_error(SB()<<dbChannelName(pChannel)<<" "<<__func__<<" ERROR : "<<dbErrorMessage.c_str());
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}
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// options has been updated to reflect meta-data actually updated.
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if(options & DBR_UNITS) {
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if(auto units = node["display.units"])
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units = meta.units;
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}
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if(options & DBR_ENUM_STRS) {
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if(auto choices = node["value.choices"]) {
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shared_array<std::string> arr(meta.no_str);
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for (epicsUInt32 i = 0; i < meta.no_str; i++) {
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arr[i] = meta.strs[i];
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}
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choices.from(arr.freeze());
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}
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}
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if(auto dlL = node["display.limitLow"]) { // if numeric
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if(options & DBR_GR_DOUBLE) {
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dlL = meta.lower_disp_limit;
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node["display.limitHigh"] = meta.upper_disp_limit;
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if(options & DBR_PRECISION) {
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node["display.precision"] = int32_t(meta.precision.dp);
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}
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}
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if(options & DBR_CTRL_DOUBLE) {
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node["control.limitLow"] = meta.lower_ctrl_limit;
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node["control.limitHigh"] = meta.upper_ctrl_limit;
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}
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if(options & DBR_AL_DOUBLE) {
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node["valueAlarm.lowAlarmLimit"] = meta.lower_alarm_limit;
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node["valueAlarm.lowWarningLimit"] = meta.lower_warning_limit;
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node["valueAlarm.highWarningLimit"] = meta.upper_warning_limit;
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node["valueAlarm.highAlarmLimit"] = meta.upper_alarm_limit;
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}
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}
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if(true) { // cheating at the moment. DESC is not marked DBE_PROPERTY
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if(auto desc = node["display.description"])
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desc = dbChannelRecord(pChannel)->desc;
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}
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}
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void IOCSource::get(Value& node, // node within top level structure addressed by Field::fieldName
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const MappingInfo &info,
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const Value& anyType,
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UpdateType::type change,
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dbChannel *pChannel, // which type of event
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db_field_log* pDbFieldLog)
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{
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if(info.type==MappingInfo::Proc || info.type==MappingInfo::Structure)
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return;
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if(info.type==MappingInfo::Const) {
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node.assign(info.cval);
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return;
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}
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if((change & UpdateType::Property) && info.type==MappingInfo::Scalar) {
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getProperties(pChannel, pDbFieldLog, node);
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}
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if((info.type==MappingInfo::Scalar || info.type==MappingInfo::Meta) && (change & (UpdateType::Value | UpdateType::Alarm))) {
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getTimeAlarm(pChannel, pDbFieldLog, node, info, change);
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}
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if((change & UpdateType::Value) && info.type!=MappingInfo::Meta) {
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Value value;
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if(info.type==MappingInfo::Scalar) {
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value = node["value"];
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} else if(info.type==MappingInfo::Any) {
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value = anyType.cloneEmpty();
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node.from(value);
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} else {
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value = node;
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}
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if(dbChannelFinalElements(pChannel)==1) {
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getScalarValue(pChannel, pDbFieldLog, value);
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} else {
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getArrayValue(pChannel, pDbFieldLog, value);
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}
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}
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}
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/**
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* Do necessary preprocessing before put operations. Check if put is allowed.
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*
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* @param pDbChannel channel to do preprocessing for
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* @param securityLogger the logger that will audit security events
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* @param credentials client credentials that are applied to this execution context
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* @param securityClient the security client. Keep in scope around the put operation
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*/
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void
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IOCSource::doPreProcessing(dbChannel* pDbChannel, SecurityLogger& securityLogger, const Credentials& credentials,
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const SecurityClient& securityClient) {
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if (pDbChannel->addr.special == SPC_ATTRIBUTE) {
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throw std::runtime_error("Unable to put value: Modifications not allowed: S_db_noMod");
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} else if (pDbChannel->addr.precord->disp && pDbChannel->addr.pfield != &pDbChannel->addr.precord->disp) {
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throw std::runtime_error("Unable to put value: Field Disabled: S_db_putDisabled");
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}
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SecurityLogger asWritePvt(pDbChannel, credentials, securityClient);
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securityLogger.swap(asWritePvt);
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}
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/**
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* Do necessary preprocessing before put operations. Check if put is allowed.
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*
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* @param securityClient security client applied to this execution context
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*/
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void IOCSource::doFieldPreProcessing(const SecurityClient& securityClient) {
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if (!securityClient.canWrite()) {
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// TODO this will abort the whole group put operation, so may be a behavior change, need to check
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throw std::runtime_error("Put not permitted");
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}
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}
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/**
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* Do necessary post processing after put operations. If this field is a processing record then do processing
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* and set status
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* Note: Only called when dbPutField() is not called.
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*
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* @param pDbChannel channel to do post processing for
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* @param forceProcessing whether to force processing, True, False
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*/
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void IOCSource::doPostProcessing(dbChannel* pDbChannel, TriState forceProcessing) {
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if (pDbChannel->addr.pfield == &pDbChannel->addr.precord->proc ||
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(forceProcessing == True) ||
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(pDbChannel->addr.pfldDes->process_passive &&
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pDbChannel->addr.precord->scan == 0 &&
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dbChannelFinalFieldType(pDbChannel) < DBR_PUT_ACKT &&
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forceProcessing == Unset)) {
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if (pDbChannel->addr.precord->pact) {
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#if EPICS_VERSION_INT >= VERSION_INT(3, 16, 2, 0)
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if (dbAccessDebugPUTF && pDbChannel->addr.precord->tpro) {
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printf("%s: single source onPut to Active '%s', setting RPRO=1\n",
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epicsThreadGetNameSelf(), pDbChannel->addr.precord->name);
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}
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#endif
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pDbChannel->addr.precord->rpro = TRUE;
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} else {
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pDbChannel->addr.precord->putf = TRUE;
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log_debug_printf(_log, "dbProcess %s\n", pDbChannel->name);
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DBErrorMessage dbErrorMessage(dbProcess(pDbChannel->addr.precord));
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if (dbErrorMessage) {
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throw std::runtime_error(dbErrorMessage.c_str());
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}
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}
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}
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}
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/**
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* Set a flag that will force processing of record in the specified security control object
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*
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* @param pvRequest the request
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* @param securityControlObject the security control object to update
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*/
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void IOCSource::setForceProcessingFlag(server::RemoteLogger *op, const Value& pvRequest,
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const std::shared_ptr<SecurityControlObject>& securityControlObject)
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{
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auto proc = pvRequest["record._options.process"];
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bool b;
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std::string s;
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if(!proc) {
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return; // not provided
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} else if(proc.as(b)) { // actual bool, integer, or string parsable to bool
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securityControlObject->forceProcessing = b ? True : False;
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return;
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} else if(proc.as(s)) {
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if(s=="passive") {
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securityControlObject->forceProcessing = Unset;
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return;
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}
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}
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// oops, unsupported type or unexpected value
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op->logRemote(Level::Warn, SB()<<"Ignoring unsupported "<<pvRequest.nameOf(proc)<<": "<<proc);
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}
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static
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void doDbPut(dbChannel* pDbChannel, short dbr, const void *pValueBuffer, size_t nElements)
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{
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long status;
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if (dbChannelFieldType(pDbChannel) >= DBF_INLINK && dbChannelFieldType(pDbChannel) <= DBF_FWDLINK) {
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status = dbChannelPutField(pDbChannel, dbr, pValueBuffer, nElements);
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} else {
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status = dbChannelPut(pDbChannel, dbr, pValueBuffer, nElements);
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}
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DBErrorMessage dbErrorMessage(status);
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if (dbErrorMessage) {
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throw std::runtime_error(dbErrorMessage.c_str());
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}
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}
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static
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void putScalar(dbChannel* pDbChannel, const Value& value)
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{
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union {
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epicsUInt8 UCHAR;
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epicsUInt16 USHORT;
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epicsUInt32 ULONG;
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epicsUInt64 UINT64;
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epicsInt8 CHAR;
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epicsInt16 SHORT;
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epicsInt32 LONG;
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epicsInt64 INT64;
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float FLOAT;
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double DOUBLE;
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char STRING[MAX_STRING_SIZE];
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} buf;
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switch(dbChannelFinalFieldType(pDbChannel)) {
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#define CASE(DBR, CTYPE) case DBR_ ## DBR: buf.DBR = value.as<CTYPE>(); break
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CASE(CHAR, int8_t);
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case DBR_ENUM:
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CASE(SHORT, int16_t);
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CASE(LONG, int32_t);
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CASE(UCHAR, uint8_t);
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CASE(USHORT, uint16_t);
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CASE(ULONG, uint32_t);
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#ifdef DBR_INT64
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CASE(INT64, int64_t);
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CASE(UINT64, uint64_t);
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#endif
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CASE(FLOAT, float);
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CASE(DOUBLE, double);
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#undef CASE
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case DBR_STRING:
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{
|
|
auto s(value.as<std::string>());
|
|
strncpy(buf.STRING, s.c_str(), MAX_STRING_SIZE-1u);
|
|
buf.STRING[MAX_STRING_SIZE-1u] = '\0';
|
|
break;
|
|
}
|
|
default:
|
|
throw std::logic_error(SB()<<__func__<<" unhandled case "<<dbChannelFinalFieldType(pDbChannel));
|
|
}
|
|
|
|
doDbPut(pDbChannel, dbChannelFinalFieldType(pDbChannel), &buf, 1u);
|
|
}
|
|
|
|
static
|
|
void putLongString(dbChannel* pDbChannel, const Value& value)
|
|
{
|
|
auto str(value.as<std::string>());
|
|
auto N = str.size()+1u; // include NIL
|
|
|
|
doDbPut(pDbChannel, DBR_CHAR, str.c_str(), N);
|
|
}
|
|
|
|
static
|
|
void putStringArray(dbChannel* pDbChannel, const Value& value)
|
|
{
|
|
auto arr = value.as<shared_array<const std::string>>();
|
|
|
|
std::vector<char> buf(MAX_STRING_SIZE * arr.size());
|
|
|
|
char* pCurrent = buf.data();
|
|
for (auto& element: arr) {
|
|
element.copy(pCurrent, MAX_STRING_SIZE - 1);
|
|
pCurrent += MAX_STRING_SIZE;
|
|
}
|
|
|
|
doDbPut(pDbChannel, DBR_STRING, buf.data(), arr.size());
|
|
}
|
|
|
|
static
|
|
void putArray(dbChannel* pDbChannel, const Value& value)
|
|
{
|
|
auto arr = value.as<shared_array<const void>>();
|
|
|
|
short dbr;
|
|
switch(arr.original_type()) {
|
|
case ArrayType::Null:
|
|
return;
|
|
case ArrayType::Bool:
|
|
case ArrayType::Value:
|
|
default:
|
|
throw std::runtime_error(SB()<<"Unsupported "<<__func__<<" from "<<arr.original_type());
|
|
case ArrayType::Int8: dbr = DBR_CHAR; break;
|
|
case ArrayType::Int16: dbr = DBR_SHORT; break;
|
|
case ArrayType::Int32: dbr = DBR_LONG; break;
|
|
case ArrayType::UInt8: dbr = DBR_UCHAR; break;
|
|
case ArrayType::UInt16: dbr = DBR_USHORT; break;
|
|
case ArrayType::UInt32: dbr = DBR_ULONG; break;
|
|
#ifdef DBR_INT64
|
|
case ArrayType::Int64: dbr = DBR_INT64; break;
|
|
case ArrayType::UInt64: dbr = DBR_UINT64; break;
|
|
#endif
|
|
case ArrayType::Float32: dbr = DBR_FLOAT; break;
|
|
case ArrayType::Float64: dbr = DBR_DOUBLE; break;
|
|
case ArrayType::String:
|
|
putStringArray(pDbChannel, value);
|
|
return;
|
|
}
|
|
|
|
doDbPut(pDbChannel, dbr, arr.data(), arr.size());
|
|
}
|
|
|
|
/**
|
|
* Put a given value to the specified channel. Throw an exception if there are any errors.
|
|
*
|
|
* @param pDbChannel the channel to put the value into
|
|
* @param value the value to put
|
|
*/
|
|
void IOCSource::put(dbChannel* pDbChannel, const Value& node, const MappingInfo &info) {
|
|
Value value;
|
|
switch(info.type) {
|
|
case MappingInfo::Meta:
|
|
case MappingInfo::Proc:
|
|
case MappingInfo::Structure:
|
|
return; // can't write
|
|
case MappingInfo::Any:
|
|
value = node["->"]; // de-ref into Any
|
|
break;
|
|
case MappingInfo::Plain:
|
|
value = node;
|
|
break;
|
|
case MappingInfo::Scalar:
|
|
value = node["value"];
|
|
if(value.type()==TypeCode::Struct)
|
|
value = value["index"]; // NTEnum
|
|
break;
|
|
case MappingInfo::Const:
|
|
value = info.cval;
|
|
break;
|
|
}
|
|
|
|
log_debug_printf(_log, "dbPut %s\n", pDbChannel->name);
|
|
|
|
if (dbChannelFinalElements(pDbChannel) == 1) {
|
|
putScalar(pDbChannel, value);
|
|
} else if(dbChannelFinalFieldType(pDbChannel) == DBR_CHAR && value.type()==TypeCode::String) {
|
|
putLongString(pDbChannel, value);
|
|
} else if(dbChannelFinalFieldType(pDbChannel) == DBR_STRING) {
|
|
putStringArray(pDbChannel, value);
|
|
} else {
|
|
putArray(pDbChannel, value);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Utility function to get the TypeCode that the given database channel is configured for
|
|
*
|
|
* @param pDbChannel the pointer to the database channel to get the TypeCode for
|
|
* @param errOnLinks determines whether to throw an error on finding links, default no
|
|
* @return the TypeCode that the channel is configured for
|
|
*/
|
|
TypeCode IOCSource::getChannelValueType(const Channel& chan, const bool errOnLinks) {
|
|
/* for links, could check dbChannelFieldType().
|
|
* for long strings, dbChannelCreate() '$' handling overwrites dbAddr::field_type
|
|
* (for some reason...)
|
|
*/
|
|
if(!chan)
|
|
throw std::runtime_error("Missing required +channel");
|
|
auto field_type(dbChannelFldDes(chan)->field_type);
|
|
auto final_field_type(dbChannelFinalFieldType(chan));
|
|
|
|
if(errOnLinks && field_type >= DBF_INLINK && field_type <= DBF_OUTLINK)
|
|
throw std::runtime_error("Link fields not allowed in this context");
|
|
|
|
bool isArray = dbChannelFinalElements(chan)!=1;
|
|
|
|
// string-like field being treated as single char[]. aka. long string
|
|
if(final_field_type==DBR_CHAR && isArray && strcmp(chan.format(), "String")==0)
|
|
return TypeCode::String;
|
|
|
|
TypeCode valueType(fromDbrType(final_field_type));
|
|
|
|
if(isArray)
|
|
valueType = valueType.arrayOf();
|
|
|
|
return valueType;
|
|
}
|
|
|
|
static
|
|
thread_local server::ExecOp* currentOp;
|
|
|
|
CurrentOp::CurrentOp(server::ExecOp *op)
|
|
:prev(currentOp)
|
|
{
|
|
currentOp = op;
|
|
}
|
|
|
|
CurrentOp::~CurrentOp()
|
|
{
|
|
currentOp = prev;
|
|
}
|
|
|
|
server::ExecOp*
|
|
CurrentOp::current()
|
|
{
|
|
return currentOp;
|
|
}
|
|
|
|
} // pvxs
|
|
} // ioc
|